Swarmkit笔记（13）——swarmctl通过controlClient向swarm cluster发命令

swarmctl实质上是通过controlClient向swarm cluster发命令。controlClient定义在api/control.pb.go：

// Client API for Control service

type ControlClient interface {
    GetNode(ctx context.Context, in *GetNodeRequest, opts ...grpc.CallOption) (*GetNodeResponse, error)
    ListNodes(ctx context.Context, in *ListNodesRequest, opts ...grpc.CallOption) (*ListNodesResponse, error)
    ......
}

type controlClient struct {
    cc *grpc.ClientConn
}

func NewControlClient(cc *grpc.ClientConn) ControlClient {
    return &controlClient{cc}
}

func (c *controlClient) GetNode(ctx context.Context, in *GetNodeRequest, opts ...grpc.CallOption) (*GetNodeResponse, error) {
    out := new(GetNodeResponse)
    err := grpc.Invoke(ctx, "/docker.swarmkit.v1.Control/GetNode", in, out, c.cc, opts...)
    if err != nil {
        return nil, err
    }
    return out, nil
}

......